Hibernate - relacionamentos [Resolvido]

idPai = new Empresa();

package modelo.entidade;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;


@Entity
@Table(name = "empresa")
    @SequenceGenerator(sequenceName = "empresa_id_seq", allocationSize = 1, initialValue = 0, name = "empresa_id_seq")
public class Empresa implements Serializable {
    @Id
    @GeneratedValue(generator = "empresa_id_seq")
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;
    @Column(name = "nome")
    private String nome;
    @Column(name = "cnpj")
    private String cnpj;
 
	@OneToMany(mappedBy = "idPai")
    private List<Empresa> empresaList;

    @JoinColumn(name = "id_pai", referencedColumnName = "id")
    @ManyToOne(cascade={CascadeType.PERSIST,CascadeType.REMOVE,CascadeType.MERGE},fetch=FetchType.LAZY)
    private Empresa idPai;

    public Empresa() {
        empresaList= new ArrayList<Empresa>();
        idPai = new Empresa();
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getNome() {
        return nome;
    }

    public void setNome(String nome) {
        this.nome = nome;
    }

    public String getCnpj() {
        return cnpj;
    }

    public void setCnpj(String cnpj) {
        this.cnpj = cnpj;
    }

    public List<Empresa> getEmpresaList() {
        return empresaList;
    }

    public void setEmpresaList(List<Empresa> empresaList) {
        this.empresaList = empresaList;
    }

    public Empresa getIdPai() {
        return idPai;
    }

    public void setIdPai(Empresa idPai) {
        this.idPai = idPai;
    }
    
    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        if (!(object instanceof Empresa)) {
            return false;
        }
        Empresa other = (Empresa) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "modelo.entidade.Empresa[id=" + id + "]";
    }
}

public void instanciar(){
           empresaList= new ArrayList<Empresa>();  
           idPai = new Empresa();
}